Means for preventing deterioration of electrodes in heat-treating



April 22, 1947. F. c. AMES INVEN TOR. FPfl/VK C. 6 /755 Patented Apr. .22, 1947 MEANS FOR PREVENTING DETERIORAIION' 0F ELECTRGDEfii EN HEA'I-TREATING ljietroit, Mich.

Application October 25, 1944, Serial N0. 560,331

(CL Lit-23? i raiila C.

2 Claims.

This invention relates to means for preventing deterioration 0i electrodes in salt pots used in heat treating metal elements.

The electrodes in the usual salt eet are eaten away either by vapors arising from the surface of the liquid in the pot or due to the salt liquid itself at the surface thereof in the pot which becomes encrusted. on the electrodes and terms to rise thereon by capillary attraction.

These and other features and objects of the invention are hereinafter more fully described and claimed and apparatus involving my invention is shown in its preferred form. in the accompanying drawing in Which- Fig. l is a sectional view of e. salt pot showing the electrodes positioned therein.

Fig, 2 is a cross section taken on line 2 Fig. 1.

In the heat treating of material in a salt pot the vapors arising from the surface of thei liquid attack the surface of the electrodes distance above the liquid level which is usiia maintained submantielly constant.

To prevent such deterioration 1 encase the clea trodes in a refractory material, indieated at i Figs. 1 and 2, at such point on the electrodes 2 and 3 that the refractory material extends to below the liquid level normally called the salt line, and extends upwardly for such distance tiiereeihcve as may be required to prevent the arising from the iiquici surface from tasting the electrodes.

' By this arrangement the electrodes re be constantly used over a long period avoiding the cost in electrodes and time required by frequent replacement theseof. While the invention is simple in' character it effects a meteriai saving in cost of electredes not provided with such ora tection.

The pre'erred material utilized in the refractory element is a chromemieg high temperature cement mixed. with a suit grog. The mixture is rammed into a form i provide the desired shape and density. This 1113' terial has chemical characteristics insuring strong refractory bond having the desired strength and effectively resistant to flexing agents.

a file of form within the spirit and tion.

Having thus briefly described my" utility and mode of operation. what desire to se ure by Letters Pat: States is:

1. Means for preventing Cifiilfilifi trodes used in salt baths for heat metal articles, comprising a shield tori Number Name 

